KP276A1201XTMA1

KP276A1201 Digital Absolute Pressure Sensor dTurboTMAP with SENT Output and Temperature Sensor Interface Features • • • • • • • • • Increased media robustness for current automotive requirements High accuracy pressure sensing (± 0.77% FSS) Integrated signal processing for external temperature sensor SENT protocol interface Real 12-bit pressure resolution Real 12-bit temperature resolution Self diagnosis features “Green” 8 pin SMD housing Automotive qualified Potential applications • • Automotive applications, Industrial control Consumer applications, Medical applications Product validation Qualified for automotive applications. Product validation according to AEC-Q100. Description The KP276A1201 is a miniaturized Digital Absolute Pressure Sensor IC based on a capacitive principle. It is surface micromachined with a monolithic integrated signal conditioning circuit implemented in BiCMOS technology. The sensor converts a pressure into a 12-bit digital value and sends the information via the SENT protocol (SAE J2716 revised April 2016). In addition, an interface for an external negative temperature coefficient (NTC) temperature sensor is provided. The temperature information given by the NTC is also digitized into a 12-bit value and transmitted with the SENT protocol. A special safety feature is the integrated diagnostic mode, which allows testing of the sensor cells as well as the signal path. This diagnosis is triggered by powering the device. The chip is packaged in a “green” media robust SMD housing. The sensor has been primarily developed for measuring manifold air pressure, but can also be used in other application fields. The high accuracy, high sensitivity and safety features of the device makes it a perfect fit for advanced automotive applications as well as in industrial and consumer applications. Type Package Ordering Code Marking KP276A1201 PG-DSOF-8-162 SP002627796 KP276A1201 Datasheet www.infineon.com Please read the Important Notice and Warnings at the end of this document Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Table of contents Table of contents dTurboTMAP with SENT Output and Temperature Sensor Interface . . . . . . . . . . . . . . . . . . . . . . . .1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Potential applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Product validation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1 1.1 1.2 1.3 1.4 1.4.1 1.4.2 1.5 1.5.1 1.6 1.6.1 1.6.2 1.6.2.1 1.6.2.2 1.6.2.3 1.6.2.4 1.6.3 1.6.4 1.6.5 1.6.5.1 1.6.5.2 1.6.5.3 1.6.5.4 1.6.6 1.7 1.7.1 1.7.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Transfer function pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 Pressure transfer function characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pressure accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Transfer function temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Temperature transfer function characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 SENT interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Physical layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Data link layer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Nibble specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Status and communication nibble . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Enhanced serial message format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Enhanced serial message data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Pressure channel output codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Temperature channel output codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Diagnostic Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Signal out of range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Diag1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15 Diag2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 EEPROM Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16 Definition of Pressure signal path latency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 External temperature sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 Linearization of the external temperature sensor transfer function . . . . . . . . . . . . . . . . . . . . . . . . .17 Accuracy for NTC signal processing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2 2.1 2.2 2.3 Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Application circuit example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18 Application circuit example for EMC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Datasheet 2 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Table of contents 2.4 2.5 Operating range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 3 3.1 3.2 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 PG-DSOF-8-162 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 Identification code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 Datasheet 3 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1 Functional description 1.1 Pin configuration Figure 1 shows the pin configuration. NCS 1 8 GND CLK 2 7 INNTC SDI 3 6 SENTOUT SDO 4 5 VDD Figure 1 Pin configuration (top view, figure not to scale) 1.2 Pin description Table 1 shows the pin description. Table 1 Pin description Pin No. Name Function Comment 1 NCS Not-Chip-Select (active-low) Communication is enabled when NCS is low1) 2 CLK Serial Clock External clock for serial communication1) 3 SDI Serial Data In Serial data input (e.g. from a controller)1) 4 SDO Serial Data Out Tri-state serial data output1) 5 VDD Supply voltage – 6 SENTOUT SENT output Digital Output of the SENT Interface 7 NTCIN NTC Input Input pin for an external NTC 8 GND Ground – 1 SPI pins (Pin No. 1 - Pin No. 4) are used only during calibration and test. It is recommended to leave these pins floating in the application. Datasheet 4 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.3 Block Diagram Figure 2 shows the functional block diagram. Pressure Cells NCS Normal Mode/ Diagnosis Mode Digital MUX NTC ADC Signal Processing NTC Conditioning Digital Core (iSM) SPI Interface CLK SDI SDO Temperature Compensation Voltage Regulator VDD analog digital ROM VDDA VDDD Buffer Amplifier (Interface Driver) EEPROM Interface Reset SENTOUT EEPROM GND Figure 2 Functional block diagram 1.4 Transfer function pressure The KP276A1201 device is fully calibrated on delivery. The sensor has a linear transfer function between the applied pressure and the digital output signal. Output signal [LSB] 4088 3896 3000 Zo om 2000 1000 193 1 0 10 40 80 120 160 200 240 280 320 360 400 440 Pressure [kPa] Operating pressure range Figure 3 Pressure transfer function Clamping The output signal for pressure is limited internally to clamping level low (output code 1) and clamping level high (output code 4088). Datasheet 5 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.4.1 Pressure transfer function characteristics The following calibration is adjusted with the parameters Sp and offsp: pamb = Table 2 outp − offsp Sp Pressure transfer function characteristics Output Code Pressure Gain and Offset Symbol Values Unit Symbol Values Unit Symbol Value Unit pIN,1 10 kPa LSBOUT,1 193 LSB Sp 9.495 LSB/kPa pIN,2 400 kPa LSBOUT,2 3896 LSB offsp 98.05 LSB Pressure accuracy 8 2.05 7 1.79 6 1.54 5 1.28 4 1.03 3 0.77 2 0.51 1 0.26 -40 0 85 Relative error [%FSS] Absolute error [kPa] 1.4.2 150 Temperature [°C] Figure 4 Datasheet Accuracy for pressure acquisition 6 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.5 Transfer function temperature Output signal [LSB] 2400 2000 1785 1600 Zo 1200 om 800 400 265 0 -50 -40 0 50 100 150 200 Temperature [°C] Operating temperature range Operating peak temperature range Figure 5 Temperature transfer function 1.5.1 Temperature transfer function characteristics The following calibration is adjusted with the parameters ST and offsT: Tamb = Table 3 outT − offsT ST Temperature transfer function characteristics Temperature Output Code Gain and Offset Symbol Values Unit Symbol Values Unit Symbol Value Unit TIN,1 -40 °C LSBOUT,1 265 LSB ST 8.0 LSB/°C TIN,2 170 °C LSBOUT,2 1945 LSB offsT 585.2 LSB Datasheet 7 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6 SENT interface The SENT interface enables communication according to the SENT (Single Edge Nibble Transmission) specification. The SENT protocol specifies the transmission of information in a series of pulses with data encoded as falling edge to falling edge periods. Each following pulse is called a nibble. The SENT interface transmits messages organized in frames. Each frame consists of several pulses which are delimited by falling edges. Each falling edge marks the start of a new nibble. • KP276A1201 SENT configuration shorthand definition: SENT2016-03.0us-6dn-ppc(282.0)-esp-A.5 1.6.1 Physical layer voltage The physical layer provides the method of transferring digital data encoded as time between two falling edges of a signal through the communication medium. It consists of power, ground and the signal wire (see Figure 16). The basic unit of time for the SENT interface is called a clock tick. The transmission bit rate depends on the data value sent and the sensor clock tolerance. The shortest length of a nibble pulse consists of 12 ticks (nominally 36 µs), the maximum length is 27 ticks (nominally 81 µs). Figure 6 shows the physical layer specification of a nibble. VOH 3.8 V 1.1 V VOL tfall time trise >4 ticks n ticks + Δtfall Figure 6 Physical layer specification of a nibble 1.6.2 Data link layer The SENT interface has two channels for transmitting information: • Fast channel • Slow channel The fast channel represents the information transmitted in the data pulses of the SENT frame. Within a single SENT frame a full pressure code and full NTC code is transmitted. The slow channel represents the information transmitted within the status and serial communication nibble. On this channel information is transmitted over several SENT frames (4 bits per SENT frame). This information consists of diagnostic codes and serial messages. The SENT frame starts with a synchronization and calibration pulse which is used by the receiver to synchronize with the frame and to create a reference for the length measurement of the following nibbles. The synchronization pulse is followed by a status and serial communication nibble. The value coded in this nibble represents a series of 4 bits. While bit #0 and bit #1 are reserved, bit #2 and bit #3 are used to communicate serial messages. Datasheet 8 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description The message transmitted by the KP276A1201 contains two fast channels. Each channel is segmented in 3 data nibbles; every nibble includes 4 bits. The 12-bit pressure information is transmitted by the first fast channel, the 12-bit temperature information of the NTC by the second fast channel. LSN MSN Temperature data nibble 2 MidN 12 – 27 ticks 12 –128 ticks Time Pause pulse LSN 12 – 27 12 – 27 ticks ticks Seed value: 0101 Polynomial: x4+x3+x2+1 12 – 27 ticks Temperature data nibble 1 MidN 12 – 27 ticks Pressure data nibble 3 MSN Pressure data nibble 2 Synchronization pulse Status & Communication nibble 12 – 27 12 – 27 ticks ticks Pressure data nibble 1 12 – 27 ticks 56 ticks 2nd fast channel CRC nibble (Calculation based on SAE J2716) 1st fast channel Temperature data nibble 3 VSENT 846 µs MSN: Most significant nibble (Bit 11:8) MidN: Middle nibble (Bit 7:4) LSN: Least significant nibble (Bit 3:0) Figure 7 Message transmission The pause pulse is used to create a SENT transmission with a constant frame length of 282 clock ticks (846 µs). 1.6.2.1 Nibble specification A nibble contains 4-bit data content. The length of a nibble defines the content of the 4 bits. The global timing of a nibble is based on ticks. The length of a tick is specified as 3 µs. The following formula defines the number of ticks (nticks) based on the nibble content (datanibble): Figure 8 shows the nibble timing. nticks = 12 + datanibble 0 >4 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 ticks 0 >12 36 39 42 45 48 51 54 57 60 63 66 69 72 75 78 81 time [µs] 0d 1d 2d 3d 4d 5d 6d 7d 8d 9d 10d 11d 12d 13d 14d 15d nibble value 0000b Figure 8 Datasheet 0001b 0010b 0011b 0100b 0101b 0110b 0111b 1000b 1001b 1010b 1011b 1100b 1101b 1110b 1111b Nibble timing 9 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6.2.2 Status and communication nibble This nibble is reserved to enable the sensor to transmit different information such as part numbers or error code information. The nibble is defined in the following table: Table 4 Status nibble description Status Nibble Bit Function 0 Fast channel-1 error flag 1 Fast channel-2 error flag 2 Serial message bit: Serial message data bit 3 Serial message bit: Serial message data bit and indicates the start of a serial message The serial message channel (slow message channel) is implemented as enhanced serial message format. 1.6.2.3 Enhanced serial message format Bit #2 and #3 of the status and communication nibble are used for serial data transmission. A serial message stretches over 18 consecutive SENT data messages. All 18 messages must be successfully received for the serial value to be valid. The frame start of a serial message is indicated by the unique pattern “1111110” in bit #3 of the status and communication nibble, Figure 10. The first “1” in a series of six “1” (after a “0”) indicates the first nibble of a serial message. Serial data bit #3 of serial communication nibble 1 - nibble 6 are set to “1”, Serial data bit #3 of serial communication nibbles 7, 13 and 18 are set to “0”. The serial message contains 20 bits of payload data. The communication is defined by the configuration bit (serial data bit #3, serial communication nibble No. 8), configuration bit = 0”: • 12-bit data and 8-bit message ID Sync Status Status ... SENT Message 3 Sync Pause Pulse Status Data 2 Sync Data 1 SENT Message 2 CRC Sync Status SENT Message 1 ... Status & Comm. Nibble Bit 3 2 1 0 Reserved Serial Communication 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Nibble Receive No. Serial Data (bit #3) 1 1 1 1 1 1 0 C 8-bit ID (7-4) 0 8-bit ID (3-0) 0 Serial Data (bit #2) Figure 9 6-bit CRC 12-bit data field Construction of enhanced serial data message from 18 SENT messages All data (data field, message ID and CRC) that is transmitted in the serial message channel is sent in the order MSB to LSB. Datasheet 10 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description Configuration bit 8-bit message ID ID7 C (MSB) ID6 ID5 ID4 ID3 ID2 ID1 ID0 (LSB) Serial Communication 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Nibble Receive No. Serial Data (bit #3) 1 1 1 1 1 1 0 0 8-bit ID (7-4) 0 8-bit ID (3-0) 0 6-bit CRC Serial Data (bit #2) CRC5 (MSB) CRC4 CRC3 CRC2 CRC1 CRC0 (LSB) 12-bit data field D11 (MSB) D10 6-bit CRC Figure 10 Datasheet D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 (LSB) 12-bit data Enhanced serial message format with 12-bit data field and 8-bit message ID 11 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6.2.4 Enhanced serial message data The following 28 serial messages are transmitted over the slow channel and continuously repeated: Table 5 Slow message channel data Messag Message ID e Number Definition 12-bit data EEPROM programmable 1 $01 Diagnostic error codes – – 2 $03 Sensor type Channel 1/2 Pressure/ Temperature 0x007 no 3 $04 Configuration Code 0x001 no 4 $05 Manufacturer Code 0x056 no 5 $06 SENT standard version 0x004 no 6 $07 Fast channel 1 characteristic X1, (X1=pIN,1) 0x053 yes 7 $08 Fast channel 1 characteristic X2, (X2=pIN,2) 0x144 yes 8 $01 Diagnostic error codes – – 9 $81 Defined by OEM/Supplier 0x000 no 10 $23 Supplementary data channel #4,1, reference 0x000 temperature (NTC temperature) no 11 $09 Fast channel characteristic Y1, default 0x0C1 no 12 $0A Fast channel characteristic Y2, default 0xF38 no 13 $29 Sensor ID #1 14 $80 Defined by OEM/Supplier 0x000 no 15 $01 Diagnostic error codes – – 16 $2A Sensor ID #2 yes 17 $2B Sensor ID #3 yes 18 $2C Sensor ID #4 yes 19 $82 OEM/Supplier 0x000 no 20 $90 OEM part number 0x510 yes 21 $91 OEM part number 0x665 yes 22 $01 Diagnostic error codes – – 23 $92 OEM part number 0x590 no 24 $93 OEM part number 0x550 no 25 $94 OEM part number 0xB91 yes 26 $95 OEM part number 0x43F yes 27 $96 OEM part number 0xCD1 yes 28 $97 OEM part number 0x4EE yes yes 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 01 03 04 05 06 07 08 01 81 23 09 0A 29 80 01 2A 2B 2C 82 90 91 01 92 93 94 95 96 97 1 2 3 4 Figure 11 Datasheet ESM cycle 12 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6.3 Pressure channel output codes Table 6 gives an overview about the pressure channel data content. Table 6 Pressure channel data content Code [dec] Code [bin] Data Nibble 1 Data Nibble 2 Data Nibble 3 Description 0 0000 0000 0000 12 ticks 12 ticks 12 ticks Invalid value 1 0000 0000 0001 12 ticks 12 ticks 13 ticks Clamping low 2 0000 0000 0010 12 ticks 12 ticks 14 ticks Min. pressure output ... ... ... ... ... ... 4087 1111 1111 0111 27 ticks 27 ticks 19 ticks Max. pressure output 4088 1111 1111 1000 27 ticks 27 ticks 20 ticks Clamping high 4089 1111 1111 1001 27 ticks 27 ticks 21 ticks Invalid value 4090 1111 1111 1010 27 ticks 27 ticks 22 ticks Diagnostic error 4091 1111 1111 1011 27 ticks 27 ticks 23 ticks Invalid value 4092 1111 1111 1100 27 ticks 27 ticks 24 ticks Invalid value 4093 1111 1111 1101 27 ticks 27 ticks 25 ticks Invalid value 4094 1111 1111 1110 27 ticks 27 ticks 26 ticks Invalid value 4095 1111 1111 1111 27 ticks 27 ticks 27 ticks Invalid value Table 7 Error indication for pressure channel Pressure kPa Fast channel 1 LSB Slow channel ID$01 Status Nibble Bit 0 Description P < -10 1 002H 1 Clamping low -10 ≤ P < 10 2 ≤ code ≤ 192 002H 0 Reduced signal accuracy 10 ≤ P ≤ 400 193 ≤ code ≤ 3896 000H 0 Signal range 400 < P ≤ 420 3897 ≤ code ≤ 4087 001H 0 Reduced signal accuracy 420 < P 4088 001H 1 Clamping high Note: Datasheet Status Nibble Bit #0 is calculated at start of every frame. Status value for slow channel is calculated at start of every slow channel status message (ID$01). 13 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6.4 Temperature channel output codes Table 8 gives an overview about the temperature channel data content. Table 8 Temperature channel data content Code [dec] Code [bin] Data Nibble 3 Data Nibble 2 Data Nibble 1 Description 0 0000 0000 0000 12 ticks 12 ticks 12 ticks Initialization 1 0000 0000 0001 12 ticks 12 ticks 13 ticks Clamping low (-73°C) ... ... ... ... ... ... 185 0000 1011 1001 12 ticks 23 ticks 21 ticks Min. temperature2) (-50°C) ... ... ... ... ... ... 2025 0111 1110 1001 19 ticks 26 ticks 21 ticks Max. temperature2) (180°C) ... ... ... ... ... ... 4088 1111 1111 1000 27 ticks 27 ticks 20 ticks Clamping high (438°C) 4089 1111 1111 1001 27 ticks 27 ticks 21 ticks Invalid value 4090 1111 1111 1010 27 ticks 27 ticks 22 ticks Diagnostic error 4091 1111 1111 1011 27 ticks 27 ticks 23 ticks Invalid value 4092 1111 1111 1100 27 ticks 27 ticks 24 ticks Invalid value 4093 1111 1111 1101 27 ticks 27 ticks 25 ticks Invalid value 4094 1111 1111 1110 27 ticks 27 ticks 26 ticks Invalid value 4095 1111 1111 1111 27 ticks 27 ticks 27 ticks Invalid value Table 9 Error indication for temperature channel Temperature2) °C Fast channel 2 LSB Slow channel ID$01 Status Nibble Bit 1 Description T < -50 code < 185 805H 1 Temperature too low -50 ≤ T < -40 185 ≤ code ≤ 265 000H 0 Accuracy undefined -40 ≤ T ≤ 170 266 ≤ code ≤ 1945 000H 0 Temperature range 170 < T ≤ 180 1946 ≤ code ≤ 2025 000H 0 Accuracy undefined T > 180 code >2025 804H 1 Temperature too high Notes: 1. The output code for fast channel 2 is limited by the NTC resistance value. 2. Status Nibble Bit #1 is calculated at start of every frame. Status value for slow channel is calculated at start of every slow channel status message (ID$01). 2 Min/max temperature output depends on external NTC due to limitation of measurement range for NTC resistance, see Table 18 Datasheet 14 Revision 1.2 2019-12-12 KP276A1201 Digital Absolute Pressure Sensor Functional description 1.6.5 Diagnostic Error Codes After power on, a system self check is started. During this initialization phase the following internal sensor checks are performed: • Pressure out of range • Signal path check (Diag1) • Sensor cell check (Diag2) • EEPROM check The signal range is continuously monitored and “Signal out of range” is transmitted with every SENT frame. Pressure out of range is transmitted over fast channel1, temperature out of range is transmitted over fast channel2. If an internal malfunction is detected, the error code 4090 is transmitted over fast channel1 and fast channel2. The error type is transmitted over the slow message channel (Diagnostic Error Code), see Table 10. If more than one error is detected, only the diagnosis code with the highest priority will be sent. Table 10 Diagnostic Error Codes Priority3) Description Normal Operation/Initialization Fast Channel1 Code Fast Channel2 Code Diagnostic Error Code channel1 data channel2 data 000H no error Internal Error 5 4090 4090 A05H Pressure out of range high 4 4088 channel2 data 001H Pressure out of range low 3 1 channel2 data 002H Temperature out of range high 2 channel1 data >2025 804H Temperature out of range low 1 channel1 data